Comprehensive evaluation method for shale aqueous phase trapping damage

• Main Authors: LI KEMING, BAI JIAJIA, LAI ZHEHAN, LIU JIANG, ZHANG XIAOYI, YOU LIJUN, LI PEISONG, CHEN MINGJUN, KANG YILI
• Format: Patent
• Language: Chinese; English
• Published: 21.04.2020
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a comprehensive evaluation method for shale aqueous phase trapping damage, which comprises the steps of preparing a rock core of a shale gas reservoir, respectively carrying out a shale aqueous phase self-absorption and flowback experiment, a shale methane adsorption/desorption experiment before and after aqueous phase trapping damage and a shale methane diffusion coefficient measurement experiment before and after aqueous phase trapping damage on the rock core, calculating each parameter, calculating a shale aqueous phase trapping damage index of the rock core according to each parameter obtained by calculation, and finally, performing comprehensive evaluation on the shale aqueous phase trapping damage according to the shale aqueous phase trapping damage index. According to the invention, the damage conditions of a matrix and a crack are distinguished, the proportions of an adsorbed gas and a free gas are considered, key evaluation indexes of the shale water phase trapping damage and